(4x+3)^2=225^2

Simplify and find the solution

hi is this correct please let me know

Step-by-step explanation:

4x

4

+91x

2

−225=0

Substitute t for x

2

.

4t

2

+91t−225=0

All equations of the form ax

2

+bx+c=0 can be solved using the quadratic formula:  

2a

−b±

b

2

−4ac

. Substitute 4 for a, 91 for b, and −225 for c in the quadratic formula.

t=

2×4

−91±

91

2

−4×4(−225)

Do the calculations.

t=

8

−91±109

Solve the equation t=

8

−91±109

 when ± is plus and when ± is minus.

t= 49

t=−25

delaney would like to make a 5lb nut mixture that is 60% peanuts and 40% almonds.

she has several pounds of peanuts and several pounds of a mixture that is 20% peanuts and 80% almonds.

let 'p' represent the number of pounds of peanuts needed to make the new mixture, and  

let 'm' represent the number of pounds of the 80% almond-20% peanut mixture.

:

p + m = 5

therefore

m = (5-p)

write an equation based on the percent of peanuts

1p + .2m = .6(5)

replace m with (5-p)

p + .2(5-p) = .6(5)

p + 1 - .2p = 3

p - .2p = 3 - 1

.8p = 2

p = 2/.8

p = 2.5 lbs of peanuts required

then

5 - 2.5 = 2.5 lbs of the peanut/almond mixture required

:

a) what is the system that models this situation?

p + m = 5

1p + .2m = .6(5)