Question

Evaluate following by using identity
(87)(85)

Answer 1

Hello!!
It is in the form (x+a)(x+b)
=x square+(a+b)x+ab
x=80,a=7,b=5
=80×80+(7+5)80+7(5)
=6400+(12)80+35
=6400+960+35
=7395

Answer 2

Answer:

7395

Step-by-step explanation:

87×85 = (90-3) (90-5)

=

$90 ^{2} + (- 3 - 5)90 + ( - 3)( - 5) \\ = 8100 - 720 + 15 \\ = 8100 - 705 \\ = 7395.$

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