Step-by-step explanation:
Which of the following will result in a difference of two squares
Answer:
Errors:
1.) substituting (-3) to (-b) is not -3, it should be a positive 3, because negative times negative is positive: -(-3)= 3
2.) doing multiplication:
-4(2)(-7)
(-8)(-7) = 56, again negative times negative is equal to positive. therefore; (-3)²-4(2)(-7) is equal to (-3)²+56
[tex]x = 3 \binom{ + }{ - } \frac{ \sqrt{ ( { - 3 )}^{2} - 4(2) ( - 7)} }{2(2)} \\ x = 3 \binom{ + }{ - } \frac{ \sqrt{ ( { 9 )}^{} -(8)( - 7)} }{2(2)} \\ x = 3 \binom{ + }{ - } \frac{ \sqrt{ ( { 9 )}^{} + 56} }{4} \\ x = 3 \binom{ + }{ - } \frac{ \sqrt{ 65} }{4} [/tex]
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Answers & Comments
Step-by-step explanation:
Which of the following will result in a difference of two squares
Answer:
Errors:
1.) substituting (-3) to (-b) is not -3, it should be a positive 3, because negative times negative is positive: -(-3)= 3
2.) doing multiplication:
-4(2)(-7)
(-8)(-7) = 56, again negative times negative is equal to positive. therefore; (-3)²-4(2)(-7) is equal to (-3)²+56
Step-by-step explanation:
[tex]x = 3 \binom{ + }{ - } \frac{ \sqrt{ ( { - 3 )}^{2} - 4(2) ( - 7)} }{2(2)} \\ x = 3 \binom{ + }{ - } \frac{ \sqrt{ ( { 9 )}^{} -(8)( - 7)} }{2(2)} \\ x = 3 \binom{ + }{ - } \frac{ \sqrt{ ( { 9 )}^{} + 56} }{4} \\ x = 3 \binom{ + }{ - } \frac{ \sqrt{ 65} }{4} [/tex]