Question

22.....................

Answer 1

Answer:

a=11,b=7

Step-by-step explanation:

To get to the result we firs multiply the figures on the left hand side.

multiplication of each term with its similar term is shown:

5×-4=-20

x⁷ₓx⁴=x¹¹. Here we add the powers because we are multiplying indices to the same base.

y²ₓ y⁵= y⁷

Thus the correct answer is a=11 and b=7

Answer 2

Answer:

$a=11,b=7$

Step-by-step explanation:

The given equation is

$(5x^7y^2)(-4x^4y^5)=-20x^ay^b$

Recall that $a^m\times a^n =a^{m+n}$

We simplify the left hand side to obtain;

$-20x^{7+4}y^{2+5}=-20x^ay^b$

This implies that;

$-20x^{11}y^{7}=-20x^ay^b$

Comparing exponents, we have

a=11,b=7

The first choice is correct.