Do this:
20(-2)-6+6(-2)-2(-2)
Answer:
5/13
Step-by-step explanation:
According to SOH CAH TOA
cos theta = adj/hyp = -12/13
Get the opposite using pythagoras theorem
13^2 = (-12)^2 + opp^2
169 = 144 + opp^2
opp^2 = 169-144
opp^2 = 25
opp = 5
Get sin θ
sin θ = opp/hyp
sin θ = 5/13
hence the value of sin θ is 5/13
Step-by-step explanation:
is it addition I got 9.75
Y = 3x + 5
(0,5) (1,8)
y = -2x + 20
(0,20) (1,18)
Answer:
The roots are -2 and -3
Step-by-step explanation:
For a quadratic equation given as x² + bx + c, for roots x and y, the sum of roots is equal to the negation of the coefficient of the second term (i.e x + y = - b) while the products of the roots is equal to the coefficient of the second term (i.e x × y = c).
Since for the roots 1 and 6, only the value of c was correct, to get c we use the product of roots. Therefore, c = 1 × 6 = 6
Since for the roots -1 and -6, only the value of b was correct, to get b we use the sum of roots. Therefore:
-b = - 1 + -4 = -5
b = 5
Since the quadratic equation is x² + bx + c, substituting value of b and c and solving:
x² + 5x + 6 = 0
x² + 2x + 3x + 6 = 0
x(x + 2) + 3(x + 2) = 0
(x + 2)(x + 3) = 0
x = -2 or x = -3
The roots are -2 and -3