Mathematics
Easy

Question

# Evaluate ( - 4a2 ), where a = - 4.

## -64    64    16    -16 Hint:

## The correct answer is: -64

### The given expression is (-4a2)There is one variable and one constant in the above expression. The variable is: ‘a’. Value assigned to the variable is a = -4. We have to substitute this value and find the final value of the expression.There is one term in the above expression. The term … means we have to multiply the variable with itself. And the multiply the whole value by (-4).We have to first substitute the value and perform the required operations.To substitute the value, we have to replace a by -4. After substituting the value, we will get the following equation:(-4a2) = [-4(-4)2]First we will square the (-4).(-4a2) = (-4 × 16)= -64Therefore, the value of equation is -64.So option (d), which is ‘-64’, is the right option.

We have to be careful about the operations because of the variables. We have to follow the proper procedure for performing the operations. The variables take different values under different conditions. So we have to be careful while substituting the values. The main part of this type of question is just replacing the variables by their values and performing the operation.

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