Question

7, ( x + 3 ) (x+7) =

a) x + 10x + 21 b) x 2

+10x +21 c) x2

- 21 d) x 2

-10x +21​

Answer 1

Answer:

B

Step-by-step explanation:

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Answer 2

|| SOLUTION ||

( x + 3 ) ( x + 7 )

We have to multiply the first term with the second term.

$\bf(x \times x)+ (x \times 7)+(3 \times x) +(3 \times 7)$

$\bf \ \: : \implies \: {x}^{2} + 7x + 3x + 21$

$\bf \ \: : \implies \: {x}^{2} + 10x + 21$

Option b Is the right answer !

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How to multiply the two terms : -

First of all , If you're an beginner , Write the steps so that you won't make any mistake.

Multiply the first term with other whole expressions , and again multiply the second term with other whole terms , After simplifying the common terms , You would get the perfect answer !

When we multiply Two terms like ( a ± b ) and ( a ± b ) , We would result in an polynomial term or an polynomial equation.

What's called an polynomial ?

★ Polynomial equation refers an equation where there would be multiple Variables and constants , provided with exponent terms too.

Examples :

• ( z - 3 ) , ( - y - 4 ) ~ With degree 1 (mono polynomial )
• x² + 2x - 6 ~ with degree 2 ( bi polynomial )

• y³ - 5 ~ with degree 3 ( tri polynomial )

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