Question

Find And Correct The Errors In The Following
a) (5a-b)²=10a²-5ab+b²
b) (p-3) (p-7)=p²+21​

Answer 1

Answer:

Correct answer is

a) (5a-b)²= 25a²- 10ab + b²

b) (p-3)(p-7) = p²-10p + 21

Step-by-step explanation:

a) (a-b)²=a²-2ab+b²

(5a)²= 25a² not 10a²

-2×5a×b = -10ab

therefore answer is (5a-b)²= 25a²- 10ab + b²

b) (x+a)(x+b) = x² +(a+b)x +ab

(p-3)(p-7) = (p)² + (-3-7)p + -3×-7 = p²-10p + 21