Question

simplify the expression below when $x = 2$
$5(7 + x) - 8 cdot x^2$
148
17
13
5
clear my selection
3 multiple choice 1 point
which expression is equivalent to
$3(5 + n)$
$(3 cdot 5) + (3 cdot n)$
$(3 cdot 5) + n$
$(3 + 5)(n)$
$(3 cdot 5) + (5 cdot n)$

Explanation:

Step1: Substitute $x=2$ into expression

$5(7+2)-8-2^2$

Step2: Solve parentheses and exponents

$5(9)-8-4$

Step3: Perform multiplication

$45-8-4$

Step4: Subtract left to right

$37-4=33$
---

Step1: Apply distributive property

$3(5+x)=3\times5 + 3\times x$

Step2: Match to option format

$(3\cdot5)+(3\cdot x)$

Answer:

1. 33
2. $(3\cdot5)+(3\cdot x)$