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4 years ago

How to solve f(-3)= -2x^2+5x

Mathematics

2 answers:

Sauron [17]4 years ago

4 0

Replace all the x values with -3

f(-3)=-2(-3)^2+5(-3)
f(-3)=2(9)-15
f(-3)=18-15
f(-3)=3

Hope I helped :)

AleksandrR [38]4 years ago

3 0

Plug -3 in for x. the equation should look like this
f(-3)=-2(-3)^2+5(-3)

simplify by multiplying and you get
f(-3)=6^2-15

now apply the exponent
f(-3)=36-15

finish it off by subtracting and you get
f(-3)=21

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<h3>What is an expression?</h3>

Expression in maths is defined as the collection of the numbers variables and functions by using signs like addition, subtraction, multiplication and division

A) If a number, n, divided by 8 equals 2.5, what is n?

n / 8 = 2.5

n = 8 x 2.5 = 20

B) The sum of a number, n, and 6.05 is 12.4. What is n?

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S $_{age}$ = ( 36 / 4)

S $_{age}$ = 9 years

Therfore the answers are n = 20 ,n = 6.35, S $_{age}$ = 9 years

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Volume of square based pyramid = 116.62 cm³

Step-by-step explanation:

Given:

Perimeter of square base = 16.9 cm

Height of pyramid = 19.6 cm

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Computation:

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AleksandrR [38]

The function rule in slope-intercept form is y = -4x -2

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