The value of -7-2-2 is -use an identity to expand-49-914-451-8449-04

Question

Toppr Admin · Accepted Answer

We will use- -a-b-2- a2-2ab-b2 to find the required result-Substitute 7 for a and 0-2 for B in the above identity-7-0-2-2-7-2-2-7-0-2-0-2-2-xA0- -xA0- -xA0- -xA0- -xA0- -xA0- -xA0- -xA0- -xA0- -xA0-49-2-8-0-04-xA0- -xA0- -xA0- -xA0- -xA0- -xA0- -xA0- -xA0- -xA0- -xA0-51-84Hence- option C is correct-

The value of $(7.2)^{2}$ is (use an identity to expand):
$49.9$
$14.4$
$51.84$
$49.04$

We will use, $(a + b)^{2}$ = $a^{2} + 2 a b + b^{2}$ to find the required result.

Substitute $7$ for $a$ and $0.2$ for $B$ in the above identity,
$(7 + 0.2)^{2} = (7)^{2} + 2 (7) (0.2) + (0.2)^{2}$
$= 49 + 2.8 + 0.04$
$= 51.84$

Hence, option $C$ is correct.

The value of (7.2)2 is (use an identity to expand):49.914.451.8449.04

We will use, (a+b)2= a2+2ab+b2 to find the required result.Substitute 7 for a and 0.2 for B in the above identity,(7+0.2)2=(7)2+2(7)(0.2)+(0.2)2 =49+2.8+0.04 =51.84Hence, option C is correct.

The value of $(7.2)^{2}$ is (use an identity to expand):
$49.9$
$14.4$
$51.84$
$49.04$

We will use, $(a + b)^{2}$ = $a^{2} + 2 a b + b^{2}$ to find the required result.

Substitute $7$ for $a$ and $0.2$ for $B$ in the above identity,
$(7 + 0.2)^{2} = (7)^{2} + 2 (7) (0.2) + (0.2)^{2}$
$= 49 + 2.8 + 0.04$
$= 51.84$

Hence, option $C$ is correct.