Question

find the value of 4ab when a + b is equal to 9 and a minus b is equal to minus 5

Answer 1

a+b=9____(I)
a-b=5______(ii)
adding eq__1 and 2
a+b+a-b=14
2a=14
a=7
NOW b=9-a=9-7=2
so 4ab=4×7×2=56. @ns
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Answer 2

a+b=9 a-b=-5 So by eliminating equation 2 from 1 we get that: a+b=9 a-b=-5 that implies  2a=4 a=2  a+b=9 2+b=9 b=9-2 b=7  4ab=4(2)(7)=56   Hope it was helpful...