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Expand (2x-4)(x+3)

We are going to use the F.O.I.L Method for this expansion,

FIRST

2x*x = 2x²

OUTSIDE

2x*3 = 6x

INSIDE

-4x*x = -4x

...

Answered by Kate P. • Maths tutor

11311 Views

Q = P / (R (4-t)), P=36, R= 3, t=-2

Substitute in each letter for the appropriate number that it equals. Q = 36 / (3 x (4--2)) Q = 36 / (3x(4+2)) Q = 36 / (3x6) Q = 36 /18 Q = 2

Answered by Michelle R. • Maths tutor

3416 Views

An ice cream cone with a base 4.5 cm in diameter and whose height is 10 cm is filled with ice cream. What is the volume of ice cream to 3 d.p.? If the density of ice cream is 1095 kg/m^3, what is the mass of ice cream in 5 cones to 3 s.f.?

Volume of cone= 1/3Pihr^2 r=2.25 V=1/3Pi102.25^2=53.01 cm^3=5.301x10&-5 m^3 Mass=density*volume Mass=(5.301x10^-5)1095= 0.05805 kg Mass of 5= 0.058055=0.290 kg

Answered by Bevan J. • Maths tutor

7488 Views

Solve e^x-6e^-x=1

Multiply everything through by e^xand rearrange so it equals zero
you now have e^2x-e^x-6=0
It is now similar to a quadratic equation, make the dummy substitu...

Answered by Kishwar I. • Maths tutor

10493 Views

1iii) Solve 7/2x^2+13/4x+1=2

In order to solve this trickier problem, the quadratic equation must be applied
x=[-b +- sqrt(b^2-4ac)]/2a

Apologies for messy notation, full solution will be demonstrated during inter...

Answered by Kishwar I. • Maths tutor

3675 Views