HELP! WILL GIVE BRAINLIEST!!! I think it's D please check Factor completely x3 + 5x2 − 3x − 15.

(x − 5)(x2 − 3)

(x + 5)(x2 + 3)

(x − 5)(x2 + 3)

(x + 5)(x2 − 3)

(x + 5)(x^2 - 3)

Step-by-step explanation:

x^3+5x ^2 −3x−15

Do the grouping x^3  + 5x^2  −3x −15 = (x^ 3  + 5x^ 2 ) + (−3x −15), and factor out x  2  in the first and −3 in the second group.

x  2 (x+5)−3(x+5)

Factor out the common term x+5 by using the distributive property. Polynomial x  2 −3 is not factored in since it does not have any rational roots.

(x+5)(x^ 2 −3)

the fourth option (x+5)(x²-3)

Step-by-step explanation:

the "-15" treks is we need a 3 and a 5 with different signs.

that eliminates the first and the second options.

and the "5x²" tells us it has to be +5, as there is only one part in the whole multiplication that delivers a x² term (5×x²).

it is also confirmed for the same reasons by "-3x" that the other number has to be -3.

step-by-step explanation:

no, her answer is not correct.   we square the lengths of all sides and then determine whether the pythagorean theorem holds here:

9² + 15² = 306.   this is not equal to the square of the longest side ( that square being 395.   answer c is correct.

144.50

step-by-step explanation:

21.5 x 13.4=288.10 divide by 2