Question

Find the value of the following expressions for a = 3, b = 2.

a. a2 + 2ab + b2

b. a3 – b3

​

Answer 1

Step-by-step explanation:

For question a. 3 × 2 + 2×3×2 + 2×2

= 6+12+4

=22

For question b. 3-3 - 2-3

= 0-5

=-5

Answer 2

• $\tt\small{\bold{Given :}}$

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⠀↠$\sf\small{\:a\: =\: 3}$

⠀↠$\sf\small{\:b\: =\: 2}$

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• $\tt\small{\bold{Question :}}$

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⠀⠀ ⠀$\sf\small{\bold{a.}}\:\sf\small{\:\:a2\: +\: 2ab \:+ \:b2}$

⠀⠀ ⠀$\sf\small{\bold{b. }}\:\sf\small{\:\:a3\: – \:b3}$

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• $\tt\small{\bold{Solution :}}$

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⠀⠀ ⠀ ⠀⠀$\huge\tt\blue{\boxed{\tt{A.\:⬇}}}$

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⠀↦$\sf\small{\:a2 \:+\: 2ab \:+\: b2}$

⠀↦$\sf\small{\:3 \:༝ \:2 \:+\: 2 \:༝\: 3\: ༝\: 2\: +\: 2\: ༝\: 2}$

⠀↦$\sf\small{\:6\: + \:12 \:+ \:4}$

⠀↦$\sf\small{\:22}$

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⠀⠀ ⠀ ⠀⠀$\huge\tt\blue{\boxed{\tt{B.\:⬇}}}$

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⠀↦$\sf\small{\:a3\: –\: b3}$ ⠀⠀ ⠀ ⠀⠀

⠀↦$\sf\small{\:3\: ༝\: 3 \:-\: 2\: ༝\: 3}$

⠀↦$\sf\small{\:9 \:-\: 6}$

⠀↦$\sf\small{\:3}$

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