Answer:

Step-by-step explanation:
Use formula

Hence,

This expression is equal to

so we can equate the coefficients at powers of x:

Answer:
A
Step-by-step explanation:
Answer: 18.84cm
Step-by-step explanation: 3 x 2 x 3.14 = 18.84cm
Answer:
8x^2+19x
Step-by-step explanation:
Simplify the expression by combining like terms. Terms which look a like and sound a like should be added together.
3x^2+7x+3+5x^2+12x
x^2 terms: 3x^2+5x^2=8x^2
x terms: 7x+12x=19x
constants: 3
Together is is 8x^2+19x+3.