(80 pts) please help 1 easy question # 5 !! Please please

Mathematics

2 answers:

MaRussiya [10]2 years ago

7 0

The third one (f+g)(x)=4x6-2x2-5x+8

babunello [35]2 years ago

6 0

Step-by-step explanation:

(f+g) (x) = x³-2x²+1 + 4x³-5x+7

= 5x³-2x²-5x+8 (option D)

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$\bold{\rm{Given}}\text{ : If y - 3x = 9, 7x + y = 25, what is the value of x and y}?$

$\bold{\rm{Solution}} \text{: We'll solve this by substitution method}$

$\dashrightarrow y - 3x = 9 \\ \\ \dashrightarrow \boxed{y = 9 + 3x } \qquad .. \sf eq(1)$

$\text{we got the value of y now getting the value of x}$

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$\hookrightarrow x = \frac{25 - y}{7} \\ \\ \hookrightarrow x = \frac{25 - 9 + 3x}{7} \\ \\ \hookrightarrow 7x = 25 - 9 + 3x \\ \\ \hookrightarrow 7x - 3x = 16 \\ \\ \hookrightarrow 4x = 16 \\ \\ \hookrightarrow x = \frac{16}{4} \\ \\ \star \quad \boxed{ \green{ \frak{ x = 4}}}$