plz ans ...using Identity
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Let us take a common say 9 as x
Substitute in this identity (X + A) (X + B) = x² + X(A+B) +AB
(9 + 0.7) ( 9 +0.8) = 9² + 9 ( 0.7 +0.8) +0.7 *0.8
= 81 + 9( 1.5) + 0.56
= 81+ 13.5 + 0.56
= 94.50 +0.56
= 95.06
Hope it helps!!
Cheers!!
Substitute in this identity (X + A) (X + B) = x² + X(A+B) +AB
(9 + 0.7) ( 9 +0.8) = 9² + 9 ( 0.7 +0.8) +0.7 *0.8
= 81 + 9( 1.5) + 0.56
= 81+ 13.5 + 0.56
= 94.50 +0.56
= 95.06
Hope it helps!!
Cheers!!
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