Write the phrase as an algerbraic expression. 4 times the sum of a number and 20
1 answer:
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ANSWER
EXPLANATION
The quadratic equation given to us is
We add half the square of the coefficient of
to both sides of the equation to obtain,
This implies that,
The right hand side simplifies to
The left hand side is a perfect square.
This gives us
We take the square root of both sides
This evaluates to
We make x the subject.
We now split the square root sign to get
.
The correct answer is A.
EXPLANATION
The quadratic equation given to us is
We add half the square of the coefficient of
to both sides of the equation to obtain,
This implies that,
The right hand side simplifies to
The left hand side is a perfect square.
This gives us
We take the square root of both sides
This evaluates to
We make x the subject.
We now split the square root sign to get
.
The correct answer is A.