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4 years ago

Prove algebraically that each expression has the same value by evaluating each expression for y=5:

Mathematics

1 answer:

Illusion [34]4 years ago

7 0

Answer:

See explanation

Step-by-step explanation:

Given two expressions

$7(3y-5)-2(10+4y)$

and

$13y-55$

Substitute y = 5 into each expression:

$7(3y-5)-2(10+4y)\\ \\=7(3\cdot 5-5)-2(10+4\cdot 5)\\ \\=7\cdot (15-5)-2\cdot (10+20)\\ \\=7\cdot 10-2\cdot 30\\ \\=70-60\\ \\=10$

$13y-55\\ \\=13\cdot 5-55\\ \\=65-55\\ \\=10$

As you can see the results are the same.

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For the function shown below, find f(3): f(x)=2x^4-8x^2+5x-7

a_sh-v [17]

We have been given the function

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We have to find the value of f(3). In order to find the same, substitute x=3 in the given function.

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Now, we simplify this step by step.

First of all $3^4=81\text{ and }3^2=9$ . Thus, we have

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