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harkovskaia [24]
3 years ago
11

Solve algebraically for x: 2(x – 4) 2 + 10 = 30

Mathematics
1 answer:
forsale [732]3 years ago
4 0

Answer:

x=4 or x=2

Step-by-step explanation:

When given the following equation,

2(x-4)^2+10=30

One must follow the order of operations to solve the equation and get a valid result. The order of operations states the following,

1. Parenthesis

2. Exponents

3. Multiplication/ Division

4. Addition/ Subtraction.

Normally, one would combine the terms in the parenthesis, but since they are unlike terms, one will have to undo the exponents first. Expand the binomial.

2(x-4)^2 + 10 = 30\\\\2(x^2-8x+16)+10=30

Now distribute, multiply every term inside the parenthesis by the term outside,

2(x^2-8x+16)+10=30\\\\2(x^2)+2(-8)x+2(16) + 10 = 30

Simplify,

2(x^2)+2(-8x)+2(16)+10=30

2x^2 -16x +32 +10 = 30

2x^2 -16x +42=30

Inverse operations,

2x^2 -16x + 42 = 30\\-30\\\\2x^2 - 16x + 12= 0

To simplify the equation, divide all terms by (2).

x^2 - 8x +6=0

Factor, rewrite the quadratic equation as a product of linear equations,

(x-4)(x-2)=0

Solve using the zero product property. The zero product property states that any number times zero equals zero,

(x-4)(x-2)=0\\\\x=4,x=2

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Answer:

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Step-by-step explanation:

Given expression :

\frac{-60}{5}

Choices given :

A) \frac{60}{-5}

B) 60\times \frac{1}{5}

C)  60\times (-\frac{1}{5})

D) -60\times (-\frac{1}{5})

To find the equivalent expression.

We will first evaluate the given expression.

\frac{-60}{5}

⇒ -12    [Quotient of a negative dividend and a positive divisor is always negative]

Evaluating each choice to select the equivalents.

A) \frac{60}{-5}

⇒ -12    [Quotient of a positive dividend and a negative divisor is always negative]

B) 60\times \frac{1}{5}

⇒ \frac{60}{5}

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C)  60\times (-\frac{1}{5})

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⇒ -12

D) -60\times (-\frac{1}{5})

⇒ \frac{60}{5}   [Product of two negatives is always a positive]

⇒ 12

∴ We see that the choices A and C are equivalent.

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