Which of the following is the standard form
of the polynomial function y = x(x + 5)(x − 3)?

y = x2 + 2x − 15
y = x3 − 8x2 − 15x
y = x2 − 8x − 15
y = x3 + 2x2 − 15x

y = x³ + 2x² - 15x

Step-by-step explanation:

Given

x(x + 5)(x - 3) ← expand the second pair of factors using FOIL

= x(x² - 3x + 5x - 15)

= x(x² + 2x - 15) ← distribute the parenthesis by x

= x³ + 2x² - 15x

37/3

step-by-step explanation:

step 1: simplify both sides of the equation.

7x+8(x+

1

4

)=3(6x−9)−8

7x+(8)(x)+(8)(

1

4

)=(3)(6x)+(3)(−9)+−8(distribute)

7x+8x+2=18x+−27+−8

(7x+8x)+(2)=(18x)+(−27+−8)(combine like terms)

15x+2=18x+−35

15x+2=18x−35

tep 2: subtract 18x from both sides.

15x+2−18x=18x−35−18x

−3x+2=−35

step 3: subtract 2 from both sides.

−3x+2−2=−35−2

−3x=−37

step 4: divide both sides by -3.

−3x

−3

=

−37

−3

x=

37

3

c.   x=2.4cm

step-by-step explanation:

similar triangles are triangles which have the same shape but not the same size. this means their angle measures are equal but their side lengths are not instead they are proportional. to solve, we will set up a proportion and solve.

a proportion is two equal ratios set equal to each other. we form the ratios by finding corresponding sides (sides which match to each other on both triangles by their position). out ratios will be one side of the small triangle over the corresponding side on the big triangle as shown below:

.

to solve the proportion, we'll cross multiply by multiplying numerator with denominator across the equal sign.