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3 years ago

(b) Factorize: x2 - 49

Mathematics

2 answers:

Svetlanka [38]3 years ago

7 0

Answer:

(x-7)(x+7)

Step-by-step explanation:

x^2 = x * x

-49 = -7 * 7

(x-7)(x+7)

irina1246 [14]3 years ago

3 0

Answer:

(x+7)(x-7)

Step-by-step explanation:

This one has the standard shape of a²-b², therefore its factorization is (a+b)(a-b).

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2 years ago

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Answer:

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2 years ago

Which property can be used to expand the expression -2(3/4x+7)

geniusboy [140]

Answer:

B. the distributive property

Step-by-step explanation:

Distributive property can be used to expand the expression -2(3/4x+7).

When that property is used, we need to distrubute the monomial to the binomial which is the two terms.

$- 2( \frac{3}{4} x + 7) \\ \Longrightarrow \boxed{- 2( \frac{3}{4} x) + - 2(7)}$

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3 years ago

Write a quadratic equation whose roots are -4 and one and who's leading coefficient is five

Alex

Step-by-step explanation:

- 4 and 1 are roots.

Therefore, (x + 4) & (x - 1) are factors and 5 is leading coefficient.

Therefore, required quadratic equation is:

$5 (x + 4) (x - 1) \\ = 5( {x}^{2} - x + 4x - 4) \\ = 5( {x}^{2} + 3x - 4) \\ = 5 {x}^{2} + 15x - 20$

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3 years ago