If a+b=1 and a-b=7 find ab
Answers
Answered by
21
Step-by-step explanation:
(a+b)²-(a-b)² = (1)²-(7)²
4ab = -48
ab = -12
Answered by
9
Step-by-step explanation:
a+b=1
a-b=7
2a=8
a=4
b=1-a
=1-4
=-3
that numbers are 4 and -3
then ab=4×(-3)
=-12
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