Question

Multiply: (a) (13 + 5) with (−4 + 2)

Answer 1

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$(13 + 5) \times ( - 4 + 2) \\ = 18 \times ( - 2) \\ = ( - 36)$

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Why so?

13 +5 = 18, by simple addition

and clearly,

2-4= (-2)

now

We know

(-a) ×(-b) = +ab

and

(+a)×(-b)=-ab

thus (-2) × 18= (-36)

Answer 2

MULTIPICATION:

(13+5)(-4+2)

= (18)(-2)

= -36

⚫ THE ANSWER IS -36.