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3 years ago

28−7x ² HELP PLEASE I WILL MAKE YOU BRAINLEIST IF YOU GET IT RIGHT !!!!!!!!!!!!

Mathematics

2 answers:

seraphim [82]3 years ago

6 0

Answer:

7 ( ( x + 2) ( x - 2 ) )

Step-by-step explanation:

28 - 7 x^2

factor out 7

7 ( 4 - x^2)

rewrite

7 ( 2^2 - x^2)

write using special products

7 ( ( 2 - x ) ( 2 + x ) )

mr_godi [17]3 years ago

4 0

Answer:

28-7x^2

7(4-x^2)

7(2^2-x^2)

7(2-x)(2+x)

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3 years ago

Mark the statements that are true.

qaws [65]

Answer:

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The correct choices are: A, B, C

Step-by-step explanation:

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3 years ago

What are the coordinates of the x-intercepts of the parabola y = x² - 8x + 15?

tamaranim1 [39]

Answer:

(3, 0) and (5, 0)

Step-by-step explanation:

we have

$y=x^{2}-8x+15$

we know that

The x-intercepts are the values of x when the value of y is equal to zero

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$x^{2}-8x+15=0$

The formula to solve a quadratic equation of the form

$ax^{2} +bx+c=0$

is equal to

$x=\frac{-b\pm\sqrt{b^{2}-4ac}} {2a}$

in this problem we have

$x^{2}-8x+15=0$

$a=1\\b=-8\\c=15$

substitute in the formula

$x=\frac{-(-8)\pm\sqrt{-8^{2}-4(1)(15)}} {2(1)}$

$x=\frac{8\pm\sqrt{4}} {2}$

$x=\frac{8\pm2} {2}$

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3 years ago

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Answer:

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