The simplified form of given expression is
<em><u>Solution:</u></em>
Given that we have to simplify the expression
<em><u>Given expression is:</u></em>
We can simplify the expression by multiplying each term in first bracket with each term term in second bracket
Simplify the above expression by multiplying the numbers in each term and adding the coefficients of like variables in each term
Combine the like terms
Thus the expression is simplified
Answer:
<h3>The option C) 15 s is correct</h3><h3>Therefore the maximum height it reaches in <u>15 seconds. </u></h3>Step-by-step explanation:
Given equation is
Given that a projectile is thrown upward so that its distance above the ground after t seconds is
"The standard form of a parabola's equation is expressed as :
.
If , then the parabola opens upwards;
if the parabola opens downwards."
The maximum height is the vertex of the parabola which is
.
Comparing the given equation with the standard form of parabola we get
the values of a=-13 , b=390 and c=0
The maximum height in .
Substitute the values we get
- + 6
divide each term on the numerator by 7b
= - 7 / 7b + 42
/ 7b
= - + 6