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Find the value by using suitable identity.
(a) $(2y+1)^2$(b) $95\times105$
Given:
(a) $(2y+1)^2$
(b) $95\times105$
To do:
We have to find the values by using suitable identities.
Solution:
We know that,
$(a+b)^2=a^2+2ab+b^2$
$(a+b)(c-d)=a\times c-a\times d+b\times c-b\times d$
Therefore,
(a) $(2y+1)^2=(2y)^2+2(2y)(1)+(1)^2$ (Using $(a+b)^2=a^2+2ab+b^2$)
$=4y^2+4y+1$.
(b) $95\times105$ can be written as $(100-5)\times(100+5)$
$95\times105=(100-5)\times(100+5)$
$=100\times 100+100\times 5-5\times 100-5\times 5$ (Using $(a+b)(c-d)=a\times c-a\times d+b\times c-b\times d$)
$=10000+500-500-25$
$=9975$.
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