3p2q2 - 4pq + 5 + (-10p2q2) + 15 + 9pq + 7p2q2
= 3p2q2 + 7p2q2 - 10p2q2 + 9pq - 4pq + 5 + 15
= 10p2q2 - 10p2q2 + 5pq + 20
= 5pq + 20 Answer
-Answered by Akki chauhan On 10 January 2019:10:54:27 AM
Question 1. Asked on :07 January 2019:02:26:38 PM
Find the sum : 3p2q2 - 4pq + 5, - 10p2q2, 15 + 9pq + 7p2q2
-Added by Master Purushottam Mathematics » Algebra Expreesion
Answer:
3p2q2 - 4pq + 5 + (-10p2q2) + 15 + 9pq + 7p2q2
= 3p2q2 + 7p2q2 - 10p2q2 + 9pq - 4pq + 5 + 15
= 10p2q2 - 10p2q2 + 5pq + 20
= 5pq + 20 Answer
-Answered by Akki chauhan On 10 January 2019:10:54:27 AM
Question 2. Asked on :07 January 2019:02:17:56 PM
Putting x = 2 (i) In x + 4, we get the value of x + 4, i.e., x + 4 = 2 + 4 = 6
-Added by Master Purushottam Mathematics » Algebra Expreesion
Answer:
( x + 1/x)² = x² + 1/x² + 2
=> 2² = x² + 1/x² + 2
=> x² + 1/x² = 4–2 = 2 . . . . . . . .(1)
(x - 1/x)² = x² + 1/x² -2
=> ( x-1/x)² = 2 - 2 = 0
=> (x-1/x) = 0 . . . . . . . . . .(2)
Now, x^4 - 1/x^4 = ( x² + 1/x²) ( x² - 1/x²)
= 2 ( x + 1/x) ( x-1/x)
= 2 * 2 * 0 ( by (1) & (2)
= > x^4 - 1/x^4 = 0
-Answered by Himanshi Verma On 22 March 2019:05:16:46 PM
Question 3. Asked on :07 January 2019:02:16:52 PM
If a = 2, b = -2, find the value of a2 + b2.
-Added by Master Purushottam Mathematics » Algebra Expreesion
Answer:
=4
The value of b2= (-22) = 4
a2+b2= 4+4
= 8
-Answered by Himanshi Verma On 22 January 2019:05:38:40 PM
Question 4. Asked on :07 January 2019:02:15:12 PM
. Simplify the expressions and find the value if x is equal to 2
(i) x + 7 + 4 (x – 5)
-Added by Master Purushottam Mathematics » Algebra Expreesion
Answer:
x+7+4(x-5)=2
x+7+4x-20=2
5x-13=2
5x=2+13
5x=15
x=3
So, The value of x is 3.
-Answered by Akki chauhan On 14 January 2019:10:15:24 AM
Question 5. Asked on :07 January 2019:02:14:21 PM
simplify the expression and find its value when a = 5 and b = -3.
2(a2 + ab) + 3 - ab
-Added by Master Purushottam Mathematics » Algebra Expreesion
Answer:
a=5, b=-3
2(52+5×(-3))+3-5×(-3)
2(25+(-15))+3+15
2(25-15)+18
2×10+18
20+18
38
-Answered by Himanshi Verma On 10 March 2019:04:58:49 PM
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