discriminant is 36.
x²-4x-5 = 0 have two real solutions.
given equation is :
we have to find discriminant of above equation.
general quadratic equation is :
ax²+bx+c = 0
comparing general equation with quadratic equation,we get
a = 1 ,b= -4 and c = -5
the formula to find discriminant is :
d = b²-4ac
putting the values of a,b and c in formula to find discriminant,we get
d = (-4)²-4()
d = 16+20
d = 36 > 0
if an equation has discriminant real and perfect square ,there are exactly two real solutions.
hence, 36 is real and greater than zero,so give equation have two real solution.
28 shorts, and 279 t-shirts.
dots is selling t-shirts for $2 a piece and has sold 279 of them that is $558.
279 shirts x 2 (dollars)= $558.
we need to see how many shorts were sold, so we are going to take the money we know didn't come from shorts and subtract it from their total sales.
$112 is left, divide 112 by 4 to see how many shorts were sold.
112/4= 28 shorts.
28 shorts and 279 t-shirts.
the correct answer is 108 cm2; 27 cm2; 135 cm2
p - parenthesis
e - exponents
m - multiply
d - divide
s - subtract
do it in this order and if there's more than one of each work left to right.