Woo Jin is solving the following equation for x xx. 7 − 4 x = x + 3 7−4x= x+3 ​ 7, minus, 4, x, equals, square root of, x, plus, 3, end square root His first few steps are given below. ( 7 − 4 x ) 2 = ( x + 3 ) 2 49 − 56 x + 16 x 2 = x + 3 (7−4x) 2 49−56x+16x 2 ​ =( x+3 ​ ) 2 =x+3 ​ Is it necessary for Woo Jin to check his answers for extraneous solutions?

Solve 2x2 + 8 = 0 by graphing the related function. there are two solutions: . there are no real number solutions. there are two solutions: 2 and -2

Acircle has a circumference of 7.850 units. what is its radius?

Ariana starts with 100 milligrams of a radioactive substance. the amount of the substance decreases by 20% each week for a number of weeks, w. the expression 100(1−0.2)w finds the amount of radioactive substance remaining after w weeks. which statement about this expression is true? a) it is the difference between the initial amount and the percent decrease. b) it is the difference between the initial amount and the decay factor after w weeks. c) it is the initial amount raised to the decay factor after w weeks. d) it is the product of the initial amount and the decay factor after w weeks.