Question

a+b=39
a-b=7
a*b=?
va rog frumos!

Answer 1

A+b=39
a-b=7
a*b=?
a=b+7
b+7+b=39
2b=39-7
2b=32
b=32:2
b=16
a=b+7
a=16+7
a=23

a*b=23*16=368

Answer 2

$a+b=39$

$a-b=7$

$(a+b)+(a-b)=2a=46=\textgreater a=\frac{46}{2}=23$

$b=39-23=16$

$a*b=16*23=368$