Which expression is a factor of 21x2 + 13x – 20?

Mathematics

1 answer:

Paul [167]3 years ago

8 0

Answer: 7x-5

Step-by-step explanation:

Assuming the expression is 21^2 + 13x -20.

(7x-5)(3x+4)

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What is the answer to 5-1/3n=-2

Free_Kalibri [48]

Answer:

21 = n

Step-by-step explanation:

$5 - \frac{1}{3}n = -2$

-5 - 5

________________

-⅓n = -7

____ __

-⅓ -⅓

21 = n

* Dividing by a fraction is the exact same as multiplying by its multiplicative inverse:

$\frac{-7}{-\frac{1}{3}} = -7 \times -3 = 21$

I am joyous to assist you anytime.

4 0

3 years ago

If x2 mx m is a perfect-square trinomial, which equation must be true? x2 mx m = (x – 1)2 x2 mx m = (x 1)2 x2 mx m = (x 2)2 x2 m

Leno4ka [110]

An expression has numbers, variables, and mathematical operations. The equation that must be true so that x²+mx+m is a perfect square trinomial is x²+mx+m=(x+2)².

<h3>What is an Expression?</h3>

In mathematics, an expression is defined as a set of numbers, variables, and mathematical operations formed according to rules dependent on the context.

A perfect square trinomial is in the form (a+b)²=a²+b²+2ab. If we compare the perfect square trinomial x²+mx+m, we will get that the value of m should be such that it satisfies the equation $m^2+2m$ . Since there is only one value that can satisfy this equation that is 2.