Answer:
The discrimant of this equation is 144.
Step-by-step explanation:
First you have to move all the variables to one side to make the equation/expression into 0 by substracting 8x² to both sides :
9x² + 14x + 13 = 8x²
9x² + 14x + 13 - 8x² = 8x² - 8x²
x² + 14x + 13 = 0
It is given that the formula of discriminant is, D = b² - 4ac where a&b&c represent the number of the equation, ax²+bx+c = 0 :
x² + 14x + 13 = 0
D = b² - 4ac
= 14² - 4(1)(13)
= 196 - 52
= 144
Answer:
yes it is right no one is mistake
4(8) - 3 • 81
The first one
Answer:
Lenght: 21 inches.
Width: 14 inches.
Step-by-step explanation:
1. You know that the width (W) of a rectangle is 7 inches less than the length (L), then:
2. The perimeter is 70 inches.
3. The formula for calculate the perimeter of a rectangle is:
3. Substitute and the value of the perimeter into the equation to calculate the perimeter and solve for the length:
4. Then the width is: