Mathematics: Asap ! use the quadratic formula to solve: 2×²-7×-21=0 round your answer to two decimal places. 1 -5.43 and 1.93 2 -1.93 and 5.43 3 -4.5 and 0.98 4 no real solution

Asap ! use the quadratic formula to solve: 2×²-7×-21=0

Ответ:

bponce06

10.03.2022

The quadratic fomula:

$ax^2+bx+c=0\\\\\Delta=b^2-4ac\\\\If\ \Delta0,\ then\ \boxed{TWO\ SOLUTIONS:\ x_1=\dfrac{-b-\sqrt\Delta}{2a}\ and\ x_2=\dfrac{-b+\sqrt\Delta}{2a}}-----------------------------------------------$

We have the equation:

$2x^2-7x-21=0\\\\a=2,\ b=-7,\ c=-21\\\\\Delta=(-7)^2-4(2)(-21)=49+168=217 0\\\\x_1=\dfrac{-(-7)-\sqrt{217}}{2(2)}=\dfrac{7-\sqrt{217}}{4}\approx-1.93\\\\x_2=\dfrac{-(-7)+\sqrt{217}}{(2)(2)}=\dfrac{7+\sqrt{217}}{4}\approx5.43\\\\\ \boxed{\boxed{2.\ -1.93\ and\ 5.43}}$

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Ответ:

andreamartinez7876

22.09.2020

Mathematics

108 and 114

Step-by-step explanation:

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Asap ! use the quadratic formula to solve: 2×²-7×-21=0 round your answer to two decimal places. 1 -5.43 and 1.93 2 -1.93 and 5.43 3 -4.5 and 0.98 4 no real solution

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