evaluate using suitable identity: 74*68
Answers
Answered by
55
Hi ,
***************************************
We know the algebraic identity :
( x + a )( x + b ) = x² + ( a + b )x + ab
********************************************
Here ,
74 × 68
= ( 70 + 4 )[ 70 + ( -2 ) ]
= 70² + [ 4 + ( - 2 ) ] 70 + 4 × ( -2 )
= 4900 + 2 × 70 - 8
= 4900 + 140 - 8
= 4900 + 132
= 5032
I hope this helps you.
: )
***************************************
We know the algebraic identity :
( x + a )( x + b ) = x² + ( a + b )x + ab
********************************************
Here ,
74 × 68
= ( 70 + 4 )[ 70 + ( -2 ) ]
= 70² + [ 4 + ( - 2 ) ] 70 + 4 × ( -2 )
= 4900 + 2 × 70 - 8
= 4900 + 140 - 8
= 4900 + 132
= 5032
I hope this helps you.
: )
Answered by
11
Answer:
identity-(x+a)(x+b)=x²+x(a+b)+ab
Step-by-step explanation:
74*68
(70+4)(70+(-2))
70²+70(4+(-2))+4*-2
4900+140-8
5032
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