Answer:
8(x + 1)
Step-by-step explanation:
Variable given to be used = x
Seven times a number ⇒ 7x
The sum of the number and eight ⇒ x + 8
∴ By addition, we have;
7x + (x + 8)
7x + x + 8
Combining like terms yields
8x + 8
By factorisation, we have
8(x + 1)
Hence, the mathematical expression for the phrase is 8(x + 1)