Question

Help me please i need to go to sleep.

Answer 1

149

Explanation:

To find the value of f(-7), we will simply substitute x = -7 in the function. Given that we have a function of:

`\displaystyle{f(x)=3x^2+2}`

Substitute in x = -7:

`\displaystyle{f(x)=3(-7)^2+2}`

Recall that by squaring the negative number will always result in positive number:

`\displaystyle{f(-7)=3\cdot 49+2}\\\\\displaystyle{f(-7)=147+2}\\\\\displaystyle{f(-7)=149}`

Therefore, the value of f(-7) will equal to 149.