Step-by-step explanation:
2x+13x-15=180 since a linear pair is a pair of consecutive angles that adds up to 180 degrees.
15x-15=180 because we combine like terms.
15x=165 because of the subtraction property of equality.
x=11 by the division property of equality.
abc=22 by substitution and multiplication
cbd=143-15 by substitution and multiplication
cde=128 by subtraction
Answer:
2x² + x - 5
(f + g)(x) = f(x) + g(x), thus
f(x) + g(x)
= - 2 + 2x² + x - 3 ← collect like terms
= 2x² + x - 5
10