Advertisements
Advertisements
Question
Use a formula to multiply of (4z – 5y)(4z + 5y)
Sum
Solution
We use the formula: (x - a)(x + a) = x2 - a2
(4z – 5y)(4z + 5y)
= (4z)2 - (5y)2
= 16z2 - 25y2
shaalaa.com
Is there an error in this question or solution?
APPEARS IN
RELATED QUESTIONS
Find the following squares by suing the identities.
(6x2 − 5y)2
Using identities, evaluate (5.2)2
Using identities, evaluate 1.05 × 9.5
Expand (5a + 6b)2
Use the formula to find the value.
502 × 498
Expand (3m + 5)2
Factorise the following, using the identity a2 + 2ab + b2 = (a + b)2.
x2 + 6x + 9
If a2 + b2 = 74 and ab = 35, then find a + b.
Verify the following:
(5x + 8)2 – 160x = (5x – 8)2
Factorise p4 + q4 + p2q2.
