Question

4x² - 3y, when x= 1/2 and y= -5

Answer 1

Answer:

16

Step-by-step explanation:

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

Answer 2

Answer:

16

Step-by-step explanation:

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

4*1/4+15

1+15=16