Advertisements
Advertisements
Question
(5 + 20)(–20 – 5) = ?
Options
− 425
375
− 625
0
Advertisements
Solution
– 625
Explanation;
Hint: (50 + 20)(–20 – 5) = – (5 + 20)2
= – (25)2
= – 625
APPEARS IN
RELATED QUESTIONS
Expand 4p2 – 25q2
(7x + 3)(7x – 4) = 49x2 – 7x – 12
Using the identity (a + b)(a – b) = a2 – b2, find the following product
(6x + 7y)(6x – 7y)
Factorise the following algebraic expression by using the identity a2 – b2 = (a + b)(a – b)
z2 – 16
Factorise the following using the identity a2 – b2 = (a + b)(a – b).
x2 – 9
Factorise the following using the identity a2 – b2 = (a + b)(a – b).
`1/36a^2b^2 - 16/49b^2c^2`
Factorise the following using the identity a2 – b2 = (a + b)(a – b).
16x4 – 625y4
Factorise the expression and divide them as directed:
(x3 + x2 – 132x) ÷ x(x – 11)
Verify the following:
(m + n)(m2 – mn + n2) = m3 + n3
Find the value of a, if pqa = (3p + q)2 – (3p – q)2
