Solve a problem of your own!
Download the Studdy App!

Math

Math Snap

PROBLEM

The functions g g and t t are defined for xR x \in \mathbb{R} as follows:
g:x4x5t:xx25x+1\begin{array}{l} g: x \rightarrow 4x - 5 \\ t: x \rightarrow x^2 - 5x + 1 \end{array} (a) Find t(6) t(6)
(b) Show that t(g(x))=16x260x+51 t(g(x)) = 16x^2 - 60x + 51

STEP 1

1. We are given two functions: g(x)=4x5 g(x) = 4x - 5 and t(x)=x25x+1 t(x) = x^2 - 5x + 1 .
2. We need to evaluate t(6) t(6) .
3. We need to show that t(g(x))=16x260x+51 t(g(x)) = 16x^2 - 60x + 51 .

STEP 2

1. Evaluate t(6) t(6) .
2. Substitute g(x) g(x) into t(x) t(x) to find t(g(x)) t(g(x)) .
3. Simplify the expression for t(g(x)) t(g(x)) .
4. Verify that the simplified expression matches 16x260x+51 16x^2 - 60x + 51 .

STEP 3

Substitute x=6 x = 6 into t(x) t(x) :
t(6)=625(6)+1 t(6) = 6^2 - 5(6) + 1

STEP 4

Simplify the expression:
t(6)=3630+1 t(6) = 36 - 30 + 1 t(6)=7 t(6) = 7

STEP 5

Substitute g(x)=4x5 g(x) = 4x - 5 into t(x) t(x) :
t(g(x))=((4x5)2)5(4x5)+1 t(g(x)) = ((4x - 5)^2) - 5(4x - 5) + 1

STEP 6

Expand (4x5)2 (4x - 5)^2 :
(4x5)2=(4x)22(4x)(5)+52 (4x - 5)^2 = (4x)^2 - 2(4x)(5) + 5^2 =16x240x+25 = 16x^2 - 40x + 25

STEP 7

Substitute the expanded form back into the expression for t(g(x)) t(g(x)) :
t(g(x))=(16x240x+25)5(4x5)+1 t(g(x)) = (16x^2 - 40x + 25) - 5(4x - 5) + 1

STEP 8

Simplify the expression:
t(g(x))=16x240x+25(20x25)+1 t(g(x)) = 16x^2 - 40x + 25 - (20x - 25) + 1

STEP 9

Combine like terms:
t(g(x))=16x240x+2520x+25+1 t(g(x)) = 16x^2 - 40x + 25 - 20x + 25 + 1 t(g(x))=16x260x+51 t(g(x)) = 16x^2 - 60x + 51

SOLUTION

Verify that the expression matches 16x260x+51 16x^2 - 60x + 51 .
The expression matches, confirming the result.
The value of t(6) t(6) is 7 \boxed{7} , and it is shown that t(g(x))=16x260x+51 t(g(x)) = 16x^2 - 60x + 51 .

Was this helpful?
banner

Start understanding anything

Get started now for free.

OverviewParentsContactPolicyTerms
TwitterInstagramFacebookTikTokDiscord