(-7x^2+3) + (4x^2+2x-1); Find the sum or difference.

1 answer:

ivann1987 [24]3 years ago

4 0

(-7x² + 3) + (4x² + 2x - 1)

-7x² + 3 + 4x² + 2x - 1

(-7x² + 4x²) + (3 - 1) + 2x collect like terms

-3x² + 2x + 2

hope this helps, God bless!

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(y+6)^2-(y-2)^2 I got 16y+26 but it is wrong?

Gemiola [76]

Answer:

16y + 32

Step-by-step explanation:

Expand each term.

(y+6)² - (y-2)²

= (y+6)(y+6) - (y-2)(y-2)

= y² + 12y + 36 - (y² - 4y + 4)

Subtract the second group by changing each term's signs

= y² + 12y + 36 - y² + 4y - 4

Collect like terms

= 16y + 32

5 0

3 years ago

Please help I found this one a bit confusing

Brums [2.3K]

Answer:

7.2

Step-by-step explanation:

To reach point D from point C, you need to add 4 to the x-value of point C and take away 6 from the y-value. These numbers are the sides of the hypothetical triangle.

The Pythagorean Theorem states that $a^2+b^2=c^2$ . If we plug the side lengths in for a and b, we get $4^2 + 6^2 = c^2$ . This can be simplified to $16+36=c^2$ , or $52 = c^2$ . If we root both sides, we find that c is equal to $\sqrt{52}$ , which is slightly more than 7, at around 7.2.