# If the value of b is 7, then what is the value of the expression -3b^{2}+25=?

**Solution:**

An algebraic expression is the combination of terms separated by + r - sign, comprising of other components such as coefficients, constants, and variables.

When the variable is given a value, the algebraic expression can be evaluated.

Here, value of b = 7

T evaluate -3b^{2}+25, Substitute the value of b in the algebraic expression, we get

- 3b^{2 }+ 25 = - 3 (7)^{2 }+ 25

So we get

= - 3 (49) + 25

= - 147 + 25

= - 122

Therefore, the value of the expression - 3b^{2 }+ 25 is - 122.

## If the value of b is 7, then what is the value of the expression -3b^{2}+25=?

**Summary:**

If the value of b is 7, then the value of the expression - 3b^{2 }+ 25 is - 122.