Question

4x² - 3y, when x= 1/2 and y= -5

Answer 1

16

Explanation:

`\text{Put the values of }\ x=(1)/(2)\ \text{and}\ y=-5\ \text{to the expression}\ 4x^2-3y:\\\\4\left((1)/(2)\right)^2-3(-5)\qquad\text{use PEMDAS}\\\\=4\left((1)/(2)\right)\left((1)/(2)\right)+(-3)(-5)\\\\=4\!\!\!\!\diagup\left((1)/(4\!\!\!\!\diagup)\right)+15\\\\=1+15\\\\=16`

Answer 2

16

Explanation:

4*(1/2)^2-3*(-5)

4*1/4+15

1+15=16