MaxWong

$f(x)=4x^2+3x-2\\ f(-3)= 4(-3)^2+3(-3)-2=25\\ .\\ .\\ f(x+1)=4(x+1)^2+3(x+1)-2\\= 4x^2+8x+4+3x+3-2\\=4x^2+11x+5$

$f(2)+f(-2)\\ = 4(2)^2+2(2)-2+4(-2)^2+2(-2)-2\\ = 16 + 4 - 2 + 16 -4 -2 \\ = 28$

19 if you are serious

8-|9-14|

= 8-|-5|

= 8 - 5

= 3

A.

You have to substitute the values into each of the functions.

$(x+ay)(x+ay)\\=x(x+ay)+ay(x+ay)\\=x^2+axy+axy+a^2y^2\\=x^2+2axy+a^2y^2$

$\pi \text{ is irrational and cannot be represented by a fraction or a decimal. }\\\text{A good approximation:}\dfrac{22}{7}\text{ or }3.14\text{.}$

-3 - 5 = -8

$8\dfrac{1}{3}\div x = 2\dfrac{1}{3}\div 8.1\\ \dfrac{25}{3}\times 8.1 = \dfrac{7}3 \times x\\ 25 \times 8.1 = 7x\\ x= 25 \times 8.1 \times \dfrac{1}{7}\\x=\frac{405}{14}=28\dfrac{13}{14}$

Total profit = 30% x 100 x 10 + (1-30%) x 100 x 15 - 1250

                  = 300 + 1050 - 1250

                  = $100 

30% of 100 books are sold for $10 : 30% x 100 x 10

The rest(100% - 30%) of 100 books are sold for $15 : (1-30%) x 100 x 15