3 years ago

Substitution system of equations How do I solve this?

Mathematics

1 answer:

Fantom [35]3 years ago

7 0

Answer:

x=-6

Y=4

Step-by-step explanation:

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Find the zeros of the function f(x)=2x^2-7x-30

ivanzaharov [21]

$2x^2-7x-30=0 \\ \\
a=2 \\ b=-7 \\ c=-30 \\
b^2-4ac=(-7)^2-4 \times 2 \times (-30)=49+240=289 \\ \\
x=\frac{-b \pm \sqrt{b^2-4ac}}{2a}=\frac{-(-7) \pm \sqrt{289}}{2 \times 2}=\frac{7 \pm 17}{4} \\
x=\frac{7-17}{4} \ \lor \ x=\frac{7+17}{4} \\
x=\frac{-10}{4} \ \lor \ x=\frac{24}{4} \\
x=-\frac{5}{2} \ \lor \ x=6 \\
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2 years ago

the booster club raised 102$ in their car wash .they want to buy 18$ soccer balls for the soccer team write and solve a inequali

hram777 [196]

Answer:

Step-by-step explanation:

102 divide 18=5.6

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3 years ago

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Chart;the answer is b

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3 years ago

For what value of a does 9 = (StartFraction 1 Over 27 EndFraction) Superscript a + 3?

vodka [1.7K]

Answer:

Step-by-step explanation:

9 = (1/27)^(a+3)

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3 years ago

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Xelga [282]

Answer:

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Step-by-step explanation:

Normal octagons look like a stop sign. This one looks like a star.

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